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  4. Aldehydes and ketones can be distinguished by:

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Q. Aldehydes and ketones can be distinguished by:

Bihar CECEBihar CECE 2002Aldehydes Ketones and Carboxylic Acids

Solution:

Define all terms
(a) Tollens reagent: It is ammoniacal silver nitrate. The aldehydes reduce it to silver and ketones shows no reaction. It is used to distinguish between aldehydes and ketones.
(b) 2,4 DNP test: Both aldehydes and ketones form orange ppt. with 2,4 DNP.
(c) Molisch test: $1 \%$ alcoholic solution of $\alpha$ naphthol is Molisch reagent. It is used to test carbohydrates in food.
(d) Mullikans test: It is done to determine charge on electron $\therefore $ choice (a) Tollens reagent is used to distinguish between aldehyde and ketones.